Telephone set



1949. E. EARLE 2,478,469

TELEPHONE SET Filed April 3, 9 6 s Sheets-Sheet 1 INVENTORZ Eowm LEARLE BY -34 I ATTORNEY E. L. EARLE TELEPHONE SET Aug. 9, 1949.

3 Sheets-Sheet 2 Filed April 3, 1946 43f 43d 43b INVENTOR: Eowm LEARLE ATTORNEY Aug. 9,1949. E. L. EARLE 2,473,469

TELEPHONE SET Filed April 3, 1946 3 Sheets-Sheet 5 PIE F |3 INVENTOR:

' EDWIN L.EARLE ATTORNEY Patented Aug. 9, 1949 1:135:33.PHONE; SET;

Edwin}; Earle, Chicago, Ill.) assignonto-Kellogg Switchboard and; Supply-; Company, Chicago 111;; a corporation of Illinois mplication Aprilfii e ia N ,298 2-"Glaims: (Cl. 173 324) This invention relates to telephone sets sllqll flfi ar nstal ed. at ubserlber, stati nsl t ener l obi etuis.tomroy de an mp vedfl ormroi base: block assem ly., onfn in ee aa oo item og ther: withlloca l nterconnectedterm nals re lfihe ma n n apparatussand,condupt s f. he n: tire te1epbon.e ets,

One... e tu .e.of be nv tion, includestb se of; sonerpleces conductor: partlv h chl, fter. as: s mbly w tbmhe fixed. rminal mem er ili he. ase. b 09 2, ead y. weara e 1?0:,.,l 11 seyeral equired loca o ductors-s nJshe.i11 1 amp d em3 odime t of tnewiniventic his; condu tor. Hart akes the, form or a; grid, punched from. sheet material, with: he several O ll 0 d1 QLQ TS left ipinecl o ethe i etainthem inn-p edete m ned fixe i ti nshi e ac the .ur.iti after they hare beenatt clne dvto the r-lresn etiye fixedter minal membfirs-o A fu er .eature pncernssthesnrovlsionlof minal members which are readily installed witl in e arate open lesi broueh hee es t locle.,,ar rel bly securedc in r laee tos ecome he. elatively fixed erminallmembers hereQi-., bese erminel m m er th u tratedg mbodimen i telsec he rmloil na ,iserew erminals il urs aped orm and een allrtubu alt n-v qcket term nals:

Ano hen eat rer sldes n. he, p. 70y s n.. ;a imple bell .nkilieyerlfor pe atiy lyl nte cqn: e tingfithes mk Wit h1 witbitsh ommi plunger. Alsneeialsrfea ure oij bis, rreneem nt' s ha the Ih ank e ee incl des 1009 adapted, o: e placedpn. a suitab e r0tpie0n w ich; theley is; retaine y, ontacts ith a hoQksW-i ch, as; sembled. aftemhelerer. is; insiqla e,

Oth r obieatslan.d.featuresioi. be nvention ,will appear; ass hei descript on, pro resses.

e ccompanyi ,draw nesgcompxi ne Fi s, Lto. .3 QWL iQWS ore.te eph nesetlco str ct d accordin -r e heir nvent on,

l es. 1. s: a perspe iv v ew.-,., I 8 fil 37 from thegfrontt of; a ,teleehone desk. set incorpo at ng the; ny nti ns.

Fig. 2 is a view of the base assemblmipeor poraieiainithei telephone: set: ofa Figs; 11 SxSfiBH from a spointiaboye the right. srearlcornenethereof;

3' is: a, bottomwiew of rbaseblock szroirl tig; 2:" in: an =unwired cond-ition except: for local conduster-50 Fig. 4"is;a view; of'grid I lll) which includes-local conductorsfifi to ll joined together by unsevered shaded sections '58i Fig, 5 is ayiew similar to. 3lsl ow neithe base block completely wired by the application 55 2; of grid lllfltbereto and'the severance of shadede tion Figs, 6 to Sarge views of-hookswitch Hl of FigS;

Egg. 9 9A are fragrnentary-views; partly in section, o fgscrew" terminal 30 of Fig: 2' and-the associated portion of the, base block;

Fig lb is a reduced-scale rearview-ofthe-telepile e e f; f e 1: with ther a "P e 11g brokenaway;

igs. 11 and12-show how the pi-n-socket-terniinals areconstructed andheld in place inbese b ock- 9:

I,i'g 13 is a sectional; view takere generally along 1e, i3=-l3-oi'1 i'g; 3; showing; how: the hOOkSWlpCh is controlled;

The; ener l; 1 rran ement:

- as late .1 a id;- he; e i s .x tt ebed ne fi e These itaehed aml nelnde a ebloekfliwhish car i sallnecesseryatt merit terminals. fertile ntire-set; cendeneenblodslfit scoil'cb oe g kenq inger L5; i ols'switch 9; toeetbe ...w.ith. ptu: i ne parts land 1 hi mount imb sebloclgfi.

Therbasee loc e.

Base-b1ock--9"is secured'to basep late 'l by three screws 49, two of "WhiQh-a1e seen in Fig. 21" Recesses 38 and 39 laterally receive handset cord Stand liner cgrd'lii incoming througlr marginal slotsin hogsingjlFig l). The metalgfastener s customarily secured to cords s ichas 5 and'fiare'convenientl'y-secured-under the heads q itlie two mounting screws 40 which lie respectiyely within recesses 38-and'-39i As is indicated'best by comparison ofFigg, 2; 3; .,3'. 1. 1.n 3,, 1. base bloekoflzh slthe ac 1 1:: o mon ormiam een e t vwi mnfiw iqb the loeaL nterconvn e lne Q9n l1tQI5 1141.1

a liance 7 relation to the base plate I on which the block is mounted. The pronged terminal ends to which interconnecting conductors 63 to H attach all lie in the same general horizontal plane.

As disclosed in the Houdek application hereinbefore referred to, screw terminals are carried in base block 9 as follows: 2| to 23 for the conductors in handset cord 5; 29, 30, 32, and 36 for the conductors contained in line cord 6; 26 and 37 for flexible leads l6 attached to ringer I5; 28 and 33-, serving as attachment points for flexible leads attached to a bridging retard coil (not shown) when a local-battery set is to be adapted for common-battery signalling; 24 and 25, provided to enable the two-position condenser link I'! to alter the condenser capacity in the ringer circuit; 3 I, provided as one connection point for a two-position ringer link l8 which cooperates alternatively with a second screw in each of the double-screw terminals 30 and 32 to enable one ringer connection to be shifted alternatively between a line conductor and ground; and screw terminals 34 to 36, which cooperate with three-position transmitter link l9, when the set is used for common-battery operation, to adapt the set for operation according to the resistance of the line to which it is connected.

A bottom view of the pin-socket terminals through which condenser block I3 and coil block 4 of Fig. 2 attach (mechanically and electrically) to base block 9 is shown in Figs. 3 and 5. These include five terminals 4la to Me for condenser block l3, and seven terminals 43a to 439 for coil block I4.

The four similar pin-socket terminals 42a to 42d are provided to receive a calling-device plug when the set is used as an automatic telephone set. When the calling device is not employed, terminals a and c in group 42 are bridged by a link 20 (Fig. 2) which may be a section of wire of suitable size, bent in the form of a staple.

Screw terminals Base block 9 has openings formed therein for receiving individually th several screw terminals 2| to 31. Each such opening is in the form of a rectangular shaft. The opening for receiving double-screw terminal 30 is shown in fragmentary sectional View Figs. 9 and 9A. Fig. 9A shows that this opening is wide enough to receive the terminal ends 53, but of insuflicient width to receive the wider main horizontal portion of the screw terminal. The terminal ends 53 are formed inwardly at their bifurcate ends for easier installation. Outwardly pointed barbs 54 engage the under surface of base block 9 to hold the screw terminal securely in its installed position. The screw terminals are preferably made of material having substantial spring action. As can be seen from Fig. 9, barbs 54 cause a slight inward compression of terminal ends 53 as screw terminal 30 is being forced downwardly into its illustrated installed position, followed by an outward snap action to the illustrated locked Position.

The width of the main horizontal portion is such that the screw terminal cannot be pushed through the opening in the direction of insertion, while the barbs 54 engage the under surface of the base block to prevent withdrawal.

' Similar openings, but of a reduced length, are

provided for single-screw terminals such as 2|, 22, etc. A single barb such as 54 suflices to retain any single-screw terminal in place.

When desired,,as when maltreatment results in a stripped screw thread, terminal 39 can be readily removed by first compressing end members 53 together sufficiently to render its retaining barbs 54 ineffective. The other screw terminals are similarly readily removable.

Pin-socket terminals Suitable openings in base block 9 are provided for each of the pin-socket terminals comprising groups 4|, 42, and 43. The wall of the base block is thickened at regions 55, 56, 51, (Fig. 3) by formations which may be described as dependent bosses. Bosses 5E and 55 are shown in section in Figs. 12 and 13. This thickening of the Wall permits a satisfactory support length for the pinsocket terminals not required for the screw terminals.

All of the pin-socket terminals may be of the same construction. Fig. 11 is an enlarged top view of the section of base block 9 which contains pin-socket terminal 421) of Figs. 2, 3, and 5, while Fig. 12 is a sectional View of the base-block fragment shown in Fig. 11, illustrating terminal 421) in profile. This terminal has the general form of a split tube which lies loosely within its opening in base block 9. A fiat flange is formed integrally with the top end of the tubular portion to limit downward movement of the terminal within the base block. This flange is wide enough to remain outside the confines of the opening in 1 any lateral position of the terminal therein, keeping in mind that the opening is enough larger (as shown) than the tubular portion of the terminal to permit substantial lateral shifting of the terminal when the pins of the dial plug (not shown) are inserted into terminals 42a to 42d (Fig, 2).

Referring to Figs. 3 and 5, it will be noted that the pin-socket terminals in groups 4|, 42, and 43 are variously positioned rotationally so as to permit concerned ones of conductors 63 to T! to enter their respective bifurcate attachment tabs. Each pin-socket terminal is retained in its desired rotational position by a locating sector such as 5| of Fig. 11. Any such sector lies within the incomplete portion of the top flange of its associated pin-socket terminal, as is shown for terminal 42b and sector 5| by Figs. 11 and 12.

Base block 9 is recessed as shown in Figs. 11 and 12 to receive the top flange of each pinsocket terminal, permitting the attachment plugs (not shown) to contact the surface of block 9 without interference, as any sector 5| is flush with its surrounding surface of the block.

' If an installed pin-socket terminal becomes damaged or excessively worn, part 52 can be recurled, or removed (as by bending it back and forth until it breaks), to permit the pin-socket terminal to be withdrawn for replacement by a new one.

The main tubular portion of terminal 42b is connected to bifurcate attachment portion 52 by a narrow neck. This construction permits part 52 to be formed generally tubular initially to enable it to be passed down through the block, and to then be flattened to its illustrated form (Figs. 3 and 5) without distorting the main tubular portion. When so flattened, part 52 is wide enough to engage the under surface of the base block to hold the pin-socket terminal reliably in pace.

The hookswitch w I As shown generally in Fig. 2, base block 9 a generally oblong, vertical opening throug'h the wall thereof for accommodating hookswitch ill. The upper portion of this opening is surrounded by a wall which has a rectangular opening in one side to accommodate insulating plate 59 of the hookswitch, and has a pair of slots'on the op- 'posite side to enable the preassembled hookswitch to be clamped in place by a pair of shoulder nuts '62. v

In Figs. 6 and *7, the hook'swit'ch in, is shown removed from the base block, while Fig. 8 (taken along line 8-8 of Fig. 3) shows a profile view of the hookswitch in place; springs a to f supported and adjusted to make contact as shown when the handset is removed from the cradle. As will subsequently be ex- ,plained, when the handset is placed on the cradle,

the free end of the hookswitch is moved to the left to cause leaf springs a and b to break contact with each other; to cause leaf springs c, d, and e, to break contact with each other{ and to cause leaf springs e and f to make contact. For this purpose, leaf-springs b and e are interconnected mechanically by an insulating stud, as

shown. v

The leaf springs are held in assembled position by the pressure applied by two screws}?! acting to clamp them and their illustrated insulating plates between clamp plates 59'and 66. Plate 60 is threaded to receive screws 6 I, which pass freely through openings in plate 59, as well as through the intervening parts.

The leaf springs are provided with downward extending tabs 49, which have bifurcate ends to receive the concerned ones of the local conductors G3 to i l (Fig. 5) lying within the cavity contained in the hollow back portion of block 9. It is to be noted that the side tabs of the leaf springs are provided in pairs, each pair being disposed at a different location along the clamped portion of the springs to enable the local conductors to make contact with them when arranged in the orderly manner shown in 5. As shown in Fig. 5, the tabs is of each such pair are bent outwardly prior to being attached to their respective conductors.

As seen best in Fig. 8, the opening in base block 9 which receives hookswit'ch is provided with a rear ledge, and with a locating bridge 43, on which parts hookswitch i2 comes to rest when inserted into the opening.

The arrangement for operating hookswitch I0 is illustrated best in Figs. 8 and 13 (see also Figs. 2, 3, and Slot 46 in the front wall of the hookswitch opening, and slot 41 in bridge 45, support pivot i l. As seen best in Fig. 13, bell-crank lever i I has a generally horizontal end portion underlying plunger i2, and a generally vertical end portion extending alongside the free end of the contact springs of hookswitch Ill. The intermediate portion of lever I! is curved to provide a pivot loop resting on pin 44 to support the lever.

During assembly, pivot pin 44 is first placed in slots 46 and ii, and the shouldered actuating plunger i2 is inserted from below and temporarily held in place, as by hand. Bell-crank lever H is next inserted and turned to bring it in place over pin 44, following which hookswitch I!) may be installed to retain parts ll, 12, and 44 in position without further fastening means.

The generally vertical arm of bell crank H is It 1mm des six leaf rotating bell crank H about pivot pin 44.

arranged to normally engage the free end of leaf spring b of hookswitch i0 and displace it slightly toward its normal (handset-on) position so as to urge plunger 12 upwardly with the shoulder thereof snugly in contact with the surrounding under surface of base block 9. The hookswitch is then in its illustrated alternate (handset-off) condition.

When the housing is finall assembled, and handset 4 is placed in its cradle as shown in Figs. 1 and 10, plunger I in the housing (in longitudinal alignment with plunger i2 carried by the base) is depressed under the weight of the handset, thereby depressing plunger i2 and The free end of the hookswitch is thereby moved to the left as seen in Fig, 13 (upwardly as seen in Fig. 6), to bring the hookswitch to its normal (handset-on) position. The hookswitch returns to its illustrated alternate position responsive to any subsequent removal of the handset.

Wiring arrangement As disclosed in the I-loudek application hereiii-before referred to, the screw terminals, hookswitch terminals, and pin-socket terminals are so distributed in the base block that (with a single exception) they may be interconnected according to the desired circuit arrangement by local con" ductors which do not cross each other. A previously noted feature of this invention resides in the method and arrangement whereby the non-crossing local conductors are installed as one piece which is later separated into the desired number of individual conductors. The practical carrying out of this feature requires care in positioning the terminal ends so as to avoidundue crowding of the local cenductcrs at congested points.

The openings in base block 9 within which screw terminals 2!, 22, 29, 3E, 32, and 3". are received, are so disposed that the biiurcate end portions of these ternnna'ls may freely re ceive conductors extending horizon't "1:! across the sheet on which Figs. 3 to 5 are drawn, while the base-block openings within which screw terminals 23 to 28, Si, 33, 35, and 3b are received, are so disposed that the bifurcate end portions of these latter terminals may freely receive n ductors extending vertically across the said sheet.

The previously described locating sectors 5! (Fig. 11) are so disposed around their associated openings within which the pin-socket terminals are received that the bifurcate terminal ends of all those in groups 4! and 42, and terminal 1 in group 43, are so disposed as to freely receive conductors extending vertically across the sheet containing Figs. 3 to 5; terminals 2), e and g of group 43 are so disposed as to receive conductors extending horizontall across the sheet; and terminals a, c, and d of this group receive conductors extending diagonally across the sheet.

Hookswitch ID is so located in the base-block assembly that the bifurcate ends of side tabs 49 thereof freely receive conductors extending horizontally across the sheet in question.

With the bifurcate terminal ends disposed as above noted, the local conductors required to interconnect them (excepting 3| and 3'!) may take the form of orderly arranged strips 63 to 11 (Fig. 5), which all lie in the same general wiring plane; are adequately separated from each other; and no one of them crosses another one of them at any point.

As shown in Fig. 4, each of the local conductors '33 to 1'! of Fig. 5 comprises a section of grid I00,- which ma be punch-formed from a single sheet about the size and shape of base block 9.

The base block 9, with all terminals in place as described, but completely unwired, is wired as shown in Fig. 5 in the following steps.

1. Wire 50 is cut to length, bent, installed in the position shown in Figs. 3 and 5, and is secured in place as by soldering it to terminals 35 and 31, or crimping the bifurcate end portions together, or both. The base block is now in the condition shown in Fig. 3.

2. Grid I is next so laid on the remaining unwired terminals shown in Fig. 3 (except spare terminal 21 and ground terminal 32) that the portions 63 to Ti thereof enter the bifurcate terminal ends according to the arrangement shown in Fig. 5.

3. These portions of grid I93 are then secured in place as by soldering them to the concerned terminals, or crimping the bifurcate ends of these terminals, or both.

4. Shaded sections 53 of grid we are next removed, as by clipping, thereby separating grid I00 of Fig. 4 into the separate conductors 03 to H of Fig. 5.

In Figs. 2 and 8, it is shown that screw terminal 31 is mounted on a raised portion of block 9, Wherefore the concerned portion of conductor 50 lies at a higher level than conductors 33 to 17, whereby the crossovers shown in Fig. 5 occur without actual contact of the concerned conductors.

I claim:

1. An assembly for a telephone substation set including a base block having openings therethrough, and a number of terminal members of substantially the same length passing through the openings, respectively, and held similarly in place therein, each said terminal member having the end portion thereof lying on a given side of the block formed to receive a local inter-terminal conductor, the base block being generally flat, whereby said end portions lie generally in the same wiring plane and support the said local conductors in such plane, a portion of the block through which one of said terminal members passes being offset longitudinally of the terminals to bring the said formed end portion of the concerned terminal member to a location between the block and said wiring plane to permit local conductors attached to-other terminal members to cross the last-named end portion without coming into contact therewith, and to permit a local conductor attached to such end portion to cross other local conductors without coming into contact therewith.

2. An assembly for a telephone substation set including a base block having openings therethrough, and terminal members of substantially the same length passing through the openings, respectively, and held similarly in place therein, each said terminal member having the end portion thereof lying on a given side of the block formed to receive a local inter-terminal conductor, the base block being generally fiat, whereby said end portions lie generally in the same wiring plane and support the said local conductors in such plane, a portion of the block through which one of said terminal members passes being ofiset longitudinally of the terminals to bring the said formed end portion .of the concerned terminal sufiiciently to one side of said wiring plane to permit a local conductor attached thereto to cross other local conductors without coming into contact therewith.

EDWIN L. EARLE.

REFERENCES CITED The following referenlces are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,717,091 Cadieux June 11, 1929 1,794,831 Caruso Mar. 3, 1931 1,912,653 Olson June 6, 1933 1,936,245 Burke Nov. 21,1933 2,008,283 King July 16, 1935 2,066,876 Carpenter et al Jan. 5, 1937 2,198,894 Werner Apr. 30, 1940 2,199,219 Edwards et al Apr. 30, 1940 2,224,902 Currie Dec. 17, 1940 2,291,808 Henning Aug. 4, 1942 2,337,692 Todd Dec. 28, 1943 2,369,541 Del Camp Feb. 13, 1945 2,399,753 McLarn May 7, 1946 FOREIGN PATENTS Number Country Date 344,677 Great Britain Mar. 12, 1931 

